Two-particle renormalizations in many-fermion perturbation theory: Importance of the Ward identity

We analyze two-particle renormalizations within many-fermion perturbation expansion. We show that present diagrammatic theories suffer from lack of a direct diagrammatic control over the physical two-particle functions. To rectify this we introduce and prove a Ward identity enabling an explicit construction of the self-energy from a given two-particle irreducible vertex. Approximations constructed in this way are causal, obey conservation laws and offer an explicit diagrammatic control of singularities in dynamical two-particle functions.Comment: REVTeX4, 4 pages, 2 EPS figure

Two phase aqueous extraction of whey proteins in a polyethylene glycol - arabinogalactan system

The whey protein separation potential of aqueous two-phase systems of arabinogalactan [AG] (Lonza FiberAidTM) and polyethylene glycol [PEG], buffered with 10 mmol/g phosphate or citrate buffer, was studied. 100 mmol/g potassium chloride [KCl] was added as required. Previously-published phase equilibrium results were verified and the absorbance of whey protein isolate [WPI] in an AG-PEG solution was measured. The effect of pH, KCl concentration, initial WPI concentrations and upper to lower phase mass ratios on whey partitioning was studied. The best separation system contained 17.20% (w/w) AG, 7.20% (w/w) PEG, 10 mmol citrate buffer (pH 5.4) and 100 mmol KCl per gram of total system. The upper to lower phase mass and volume ratios were 1:1 and 16:11 respectively. Approximately 12 mg (mainly α-lactalbumin) of the 20 mg WPI added partitioned into the AG-rich upper phase. This system has potential to reduce chromatographic requirements in large scale separation of protein mixtures

Work placement reports: Student perceptions

Engineering students complete work placement reports after being on placement in industry, the aim is to increase work place learning and to increase students understanding about the placement, themselves, career direction and skills obtained. Third and fourth year engineering students perceptions on their report writing experience, academic feedback quality, and the effect of completing work placement reports on their learning and report writing ability, were surveyed. Third year students enjoyed the experience more than fourth year students and perceived greater benefits. Fourth year student opinion was mixed, reflecting greater experience and cynicism. Fourth year students rated feedback from academics higher than the third years, perhaps because their reports were more interesting for the academics. The fourth year students were more cynical on the benefits of reflecting and reviewing what they had learned, and many considered this was not important for being an engineer

CPAs as Data Analysts: How Louisiana Accountants Respond to Data-Driven Business Paradigms

This study considered challenges confronting Louisiana Certified Public Accountants, relating to technological changes to accounting information systems, which necessitated the use of advanced analytical tools. The research emphasized the problem of accountants’ lack of preparedness to use big data analytics in accounting work. The project focused on practicing accountants in Louisiana, to gain their perspectives about big data analytics in accounting, the competitive impact technology shifts have on accounting practice, and preparedness to use accounting analytics in accounting work. The research methodology chosen was a qualitative case study design, which allowed consideration of opinions and perceptions of the individuals experiencing the challenges. This qualitative, exploratory research permitted a deeper understanding of the underlying circumstances that contributed to the problem and helped identify potential solutions to the problem

Fish powder as a low-cost component in media for producing bacterial cellulose

Some bacteria can produce extracellular bacterial cellulose (BC). This polysaccharide is chemically identical to cellulose produced by plants but has no associated lignin and hemicelluloses. The unique mechanical properties, chemical stability and purity allow BC to be exploited for a range of biomedical applications. However, medium costs limit commercial BC production. The suitability of using fish powder as a low-cost media component for producing BC by submerged culture of Gluconacetobacter xylinus in shake flasks was investigated. Fish powder was made by drying and grinding Koi carp (Cyprinus carpio), a pest fish in New Zealand waterways. Fermentations were done at 30oC in a growth medium containing 50 g/L glucose, the required minerals, and either 5 g/L yeast extract or 15 g/L fish powder, The BC yield on both yeast extract and fish powder was 0.04 g/g glucose, demonstrating fish powder was a suitable low cost ingredient for supplying nitrogen and amino acids in the media

Volume 01, Number 01

Full text of Volume 01, Number 01 of Reaching Through Teaching.https://digitalcommons.kennesaw.edu/rtt/1000/thumbnail.jp

Volume 01, Number 02

Full text of Volume 01, Number 02 of Reaching Through Teaching.https://digitalcommons.kennesaw.edu/rtt/1001/thumbnail.jp

Who Could it be Now? Challenging the Reliability of First Time In-Court Identifications After State v. Henderson and State v. Lawson

Despite the recent advances in assessing the reliability of eyewitness identifications, the focus to date has largely been identifications made pretrial. Little has been written about identifications made for the first time in the courtroom. While in-court identifications have an extraordinarily powerful effect on juries, all such identifications are potentially vulnerable to post-event memory distortion and decay. Absent an identification procedure that effectively tests the witness’s memory, it is impossible to know if the witness’s identification of the defendant is a product of his or her original memory or a product of the extraordinarily suggestive circumstances created by the in-court identification procedure. In this article, the authors discuss the science related to memory and perception and how the courts have historically addressed claims of suggestiveness in the context of eyewitness identifications and, specifically, how they have handled first time in-court identifications. They analyze the issue of first time, in-court identifications under the new legal frameworks established by the Oregon Supreme Court in State v. Lawson (2012) and the New Jersey Supreme Court in State v. Henderson (2011), which both recognize 30 years of science proving that memories are malleable and easily influenced by outside forces. They argue that, in all states, first time, in-court identifications should be inadmissible, forcing the state to conduct a reliable out-of-court identification, whether pretrial or with leave during trial